Word docx size

Hi ,
i am new to Novacode Docx ,
i build a program which read c# label and textbox and get 3 pictures on it.(docx)
i have a problem about save my document , when otomatically save my document has a 3.76 MB but when the word is open and i save as dificult name its 576 kb,.
can anyone help me please.

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